Percussive drill.



J. G. LEYNER.

PERCUSSIVB DRILL.

APPLIGATION HLBD 00121, 1912.

Patented Aug'. 4, 1914.

2 SHEETS-'SHEET 1.

u In

J. G. LEYNER.

PERGUSSIVE DRILL.

APPLICATION FILED 0012.21, 1912.

Patented Aug. 4, 1914.

2 SHEETS-SHEET 2.

S14-ve n loz. www 1 JOHN encuen LEYNEB, or DENVER, ooLonADo.

rEIwussIvE D'MLL.

Specification of Letters Yatent.

Patented Aug. 4, 1914.

appnanon'aied october' 21, 1912. sei-iai no. 726,893.

-To all whom t may concern t t Be it known that I, J oHN Gnome LnYNEn, a citizen of the United States, residing atI Denver, in the county of Denver and State of Colorado, have invented a certain new and useful Improvement in Percussive Drills, of which `the following is a specilication. e

This invention relates to percussive drills and more particularly to the form of drills wherein air or other fluid is forced into the drilled hole to clear out rock cuttings,

In many cases where heavy drilling is to be accomplished and only one or two drills are to be used, for instance in submarine drilling or in other places where the drill is more or less isolated, it is desirable to use steam direct for operating the drill instead of driving a compressor by the steam and using compressed air for the drill. In such cases it is not feasible to use the steam for blowing out the hole for several reasons, principally because of the condensation in passing through the steel. It is desirable therefore to use some other fluid, preferably air, from another source to reir ove the rock cuttings.

The object of the present invention is' to rovide a self contained drill which can be driven by one fluid and at the same time provide a supply of another fluid under pressure for blowing out the hole.

With this object in view I have devised a drill practical embodiments of which are shown in the accompanyingdrawings in which:

Figure 1 shows a plan of one modification of my drill. Fi 2 shows a longitudinal l section taken on t e line 2-2 of Fig. 1 and Figs. 3 and 4 show similar sections of other modifications.

The drill as shown comprises a cylinder 1 in which reciprocates a piston 2 the movements of which are controlled by a valve 3 of ordinary construction that forms no part v of the present invention. In the drill shown in Figs. 1 3 the cylinder is provided with a front head 4,- which has a reduced port-ion 5 fitting into an annular seat in the front end of the cylinder. Inside of t, the front head is a sleeve 6 having a flange 7 fitting in a depression in the front head. Inside the front head bore and forward of the sleeve 6 is a resilient packing ring 8 against which abuts a collar 9 which slides into the front head bore and is provided on its forward part with laterally projecting lugs 10. Through these lugs 10 pass bolts 11 which extend along the drill and are secured by nuts 12 in a transverse plate 13 at the extreme rear end of the drill. Forwardof this plate 13 is a heavy spring 14` which abuts against the back head 15 of the drill and resiliently holds it and the front head 4 in place. Into the back head 15 is set a tube 16 which projects into the drill cylinder and is secured in place by a button 17 secured thereto. This button 17 fits in a socket in the back head and is held in place by a rubber washer 18 which is in turn secured by a plug 19 threaded into the socket. The plug 19 is provided with a small bore 20 registering with the opening of the tube yand with a longitudinal groove 21 in the side which communicates with a fluid duct 22. A cap 23 is threaded over the end of the plug 19, this cap being of such depth as to allow a small clearance chamber 24 which affords communication bet-Ween the bore 20 and the groove 21. t-hus connecting the fluid-duct 22 with the tube 16.

Immediately forward of the back head is rotatably mounted a rifle bar 25, which is provided with a bore through which projects thc tube 16. The rifle bar 25 is pro' vided with a flange 26 in the periphery of which are mounted spring pressed pawls 27 which engage a ratchet ring 28. The ratchet ring 28 is frictionally held between the back head and a retaining ring 29 which abuts against a shoulder 30 in the drill cylinder. The ring 29 also serves to prevent forward movement of the rifle bar.

The piston 2 is provided with the usual bore into which the rie bar projects. From the forward end of the rifle bar bore a small bore 31 extends` passing through the piston 2 the piston rod 32 connected therewith and into the chuck 33. This bore is of suficient size to allow the tube 16 to project thereunto Vand the tube 1G is of suflicient length as to always have a small portion proJecting into the bore. As stated before the bore 31 extends through lthe piston rod 32 into the chuck 33 which is of ordinar construction and is adapted to hold a hol ow drill steel 34 so that its bore 35 registers with the bore 31.

To furnish a means for supplying a fluid under pressure to the hollow drill steel to blow out the hole, dilierent from that employed to run the drill, the following mechanism is provided: Referring to Figs. l and 2 it is seen that the piston rod 32 is provided with flanges 36` between which is se'- cured by bolts 37 a transversely projecting arm 38. ln the outer end of this arml is secured the piston rod 39 of a pump piston .40 which reciprooates in a pump cylinder 4l. The pump 'cylinder 4l is attached to the drill cylinder by means of a sleeve 42 which is attached to the cylinder and which slides over the front head, and is secured in place by lugs 43 on its sides through which the bolts l1 pass. Springs 44 between these lugs 43 and the lugs 10 of the collar 9 resiliently hold the cylinder against ifor Ward movement. Air is admitted to the pump cylinder on the rearward stroke of the drill piston through a plate valve 45 in the piston 40, and is delivered onthe forward stroke of the drill piston through a pipe 46 and connecting plug 47 to the fluid duct 22 and from there passes through the tube 16 and through'the piston bore into the drill steel clearing the hole from rock cuttings. A check valve 48 prevents any return flow from the drill into the ump.

ln Fig. 3 is shown a form similar to the form just described the main difference being that the pump cylinder is reversed so that air is taken in on the'forward stroke of the drill pistonand delivered on the rearward stroke. A different form of inlet valve is shown also, this valve consisting of a shouldered ring 49 which seats against the rear end of the pump piston rod the fluid entering the pump cylinder through inlet passages 50 and thence through the center of the ring 49.

ln Fig. 4 a distinct modification is shown. In this form the piston rod 32 is not provided with-a longitudinal bore throughout its length but only in its forward part. From this bore runs a transverse bore 51. ln the portion of the arm 38 surrounding the piston rod is an annular fluid chamber 52 which communicates with the bore 5l. From this annular chamber a duct 53 pro vided with a. check valve 54 runs through the arm 38 and piston rod 39 communicating with the pump `cylinder through the piston, air being taken into the cylinder through a piston inlet valve such as shown in Fig. 3 and previously described in connection therewith.

The operation of the device will be apparent from the above description. The drill piston is actuated by steam or other suitable fluid. lts reciprocation will cause air or other fluid, possibly Water, to be drawn into the pump piston and forced through the drill steel into the hole, eitherA .on the down stroke in. the modifications shown in Figs. l, 2 and 4 or on the up stroke in the modification shown in Fig. 3. rlhe fluid can be carried either through the back head and down through the piston as in Figs. l-3 or through the forward part of the piston rod as inFig. 4.

lt is to be understood that the present showing and description discloses only certain specified modifications of my invention and other forms and modifications are ineluded in the spirit and scope of the invention as expressed in the claims.

llf'hat ll claim is:

1. ln a fluid operated drill, adrill cylinder and a piston therein having a drill rod projecting forwardly thereof, said drill rod having a fluid conveying bore. a front head on said drill cylinder, a fluid pump cylinder secured to the front head, a piston in said fluid pump having a rod secured to said drill rod, and fluid connectionsl for conveying fluid from said pump to said drill rod bore.

2. ln a fluid operated percussive drill, a drill cylinder, a piston therein having a drill rod projecting forwardlyr thereof, said drill rod and piston having a fluid conveying bore therethrough, a back head for said cylinder, a fluid conveying tube projecting from said back head into said bore, a front hcad, a fluid pump cylinder secured to the front head, a piston in said pump cylinder secured to said drill rod and a fluid pipe connecting said pump cylinder and said tube.

ln testimony whereof, l have hereunto set my hand.

JOHN ern-ouen .tnv una.'

llfitnesses Freni) E @vermi-r9 linien C. Buonumore. 

